# US 12,224,835 B2 · Method and apparatus for reporting of time-domain channel correlation properties

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- Number: US 12,224,835 B2
- Document ID: US12224835B2
- Status: Granted
- Kind: B2
- Application number: 18/451,813
- Filed: 2023-08-17
- Published: 2024-04-04
- Granted: 2025-02-11
- Earliest claimed: 2022-08-29
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Md. Saifur Rahman; Eko Onggosanusi
- Web page: https://patentgrep.com/patent/US12224835B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 27/2663: {Coarse synchronisation, e.g. by correlation}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/0854: {using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and apparatuses for reporting of time-domain channel correlation properties are provided. A method includes receiving a configuration about a CSI report. The configuration includes information about (i) M non-zero power (NZP) CSI reference signal (RS) resources for tracking, (ii) a number (K) of time-domain correlation values, and (iii) delay values τk for k=0, 1, . . . , K−1. The method further includes, based on the configuration: measuring the M NZP CSI-RS resources for tracking, determining, based on the measurement, the K time-domain correlation values, wherein a k-th correlation value is between two CSI-RS transmission occasions that are separated by one of the delay values τk, and quantizing a value for an amplitude of each of the K time-domain correlation values. The method further includes transmitting the CSI report including an indicator, for each of the K time-domain correlation values, indicating the quantized value of the amplitude.

## Claims

### Claim 1

A user equipment (UE) comprising:
a transceiver configured to receive a configuration about a channel state information (CSI) report, the configuration including information about (i) M non-zero power (NZP) CSI reference signal (RS) resources for tracking, where M≥1, (ii) a number (K) of time-domain correlation values, where K≥1, and (iii) delay values τk for k=0, 1, . . . , K−1; and
a processor operably coupled to the transceiver, the processor, based on the configuration, configured to:
measure the M NZP CSI-RS resources for tracking,
determine, based on the measurement, the K time-domain correlation values, wherein a k-th correlation value is between two CSI-RS transmission occasions that are separated by one of the delay values τk, and
quantize a value for an amplitude of each of the K time-domain correlation values,
wherein the transceiver is further configured to transmit the CSI report including an indicator, for each of the K time-domain correlation values, indicating the quantized value of the amplitude.

### Claim 2 (depends on 1)

The UE of claim 1, wherein:
the processor is further configured to quantize a value for a phase of each of the K time-domain correlation values using a codebook of phase values
{
e
j
⁢
2
⁢
π
⁢
k
1
⁢
6
:
k
=
0
,
1
,
…
,
15
}
,
the CSI report includes a 4-bit indicator for each of the K time-domain correlation values, and
for each of the K time-domain correlation values, the 4-bit indicator indicates the quantized value of the phase.

### Claim 3 (depends on 1)

The UE of claim 1, wherein the quantized value of the amplitude is given by 1−v, where v belongs to a codebook of amplitude values including
{
1
8
⁢
2
,
1
8
,
1
4
⁢
2
,
1
4
,
1
2
⁢
2
,
1
2
,
1
2
}
.

### Claim 4 (depends on 1)

The UE of claim 1, wherein a frequency granularity of the K time-domain correlation values is wideband and is based on the measurement in a CSI reporting band configured for the CSI report.

### Claim 5 (depends on 1)

The UE of claim 1, wherein the K time-domain correlation values are normalized by a value
1
γ
,
where γ>0.

### Claim 6 (depends on 1)

The UE of claim 1, wherein a unit of the delay values τk is in terms of number of slots or number of orthogonal frequency-division multiplexing (OFDM) symbols.

### Claim 7 (depends on 1)

The UE of claim 1, wherein the K NZP CSI-RS resources are included in S CSI-RS resource sets for tracking, where S≥1.

### Claim 8 (depends on 7)

The UE of claim 7, wherein:
a value of S belongs to a set of values including {1,2}, and
a number of NZP CSI-RS resources in each of the S CSI-RS resource sets belongs to a set of values including {1,2,4}.

### Claim 9

A base station comprising:
a transceiver configured to:
transmit a configuration about a channel state information (CSI) report, the configuration including information about (i) M non-zero power (NZP) CSI reference signal (RS) resources for tracking, where M≥1, (ii) a number (K) of time-domain correlation values, where K≥1, and (iii) delay values τk for k=0, 1, . . . , K−1;
transmit the M NZP CSI-RS resources for tracking; and
receive the CSI report including an indicator, for each of the K time-domain correlation values, indicating a quantized value of an amplitude of the respective K time-domain correlation value that is based on the M NZP CSI-RS resources for tracking,
wherein a k-th correlation value is between two CSI-RS transmission occasions that are separated by one of the delay values τk.

### Claim 10 (depends on 9)

The base station of claim 9, wherein:
the CSI report includes a 4-bit indicator for each of the K time-domain correlation values,
the 4-bit indicator indicates a quantized value of a phase of the respective K time-domain correlation value, and
for each of the K time-domain correlation values, the value for the phase is quantized according to a codebook of phase values
{
e
j
⁢
2
⁢
π
⁢
k
1
⁢
6
:
k
=
0
,
1
,
…
,
15
}
.

### Claim 11 (depends on 9)

The base station of claim 9, wherein the quantized value of the amplitude is given by 1−v, where v belongs to a codebook of amplitude values including
{
1
8
⁢
2
,
1
8
,
1
4
⁢
2
,
1
4
,
1
2
⁢
2
,
1
2
,
1
2
}
.

### Claim 12 (depends on 9)

The base station of claim 9, wherein a frequency granularity of the K time-domain correlation values is wideband and is based on a CSI reporting band configured for the CSI report.

### Claim 13 (depends on 9)

The base station of claim 9, wherein the K time-domain correlation values are normalized by a value
1
γ
,
where γ>0.

### Claim 14 (depends on 9)

The base station of claim 9, wherein a unit of the delay values τk is in terms of number of slots or number of orthogonal frequency-division multiplexing (OFDM) symbols.

### Claim 15 (depends on 9)

The base station of claim 9, wherein the K NZP CSI-RS resources are included in S CSI-RS resource sets for tracking, where S≥1.

### Claim 16 (depends on 15)

The base station of claim 15, wherein:
a value of S belongs to a set of values including {1,2}, and
a number of NZP CSI-RS resources in each of the S CSI-RS resource sets belongs to a set of values including {1,2,4}.

### Claim 17

A method performed by a user equipment (UE), the method comprising:
receiving a configuration about a channel state information (CSI) report, the configuration including information about (i) M non-zero power (NZP) CSI reference signal (RS) resources for tracking, where M≥1, (ii) a number (K) of time-domain correlation values, where K≥1, and (iii) delay values τk for k=0, 1, . . . , K−1;
based on the configuration:
measuring the M NZP CSI-RS resources for tracking,
determining, based on the measurement, the K time-domain correlation values, wherein a k-th correlation value is between two CSI-RS transmission occasions that are separated by one of the delay values τk, and
quantizing a value for an amplitude of each of the K time-domain correlation values; and
transmitting the CSI report including an indicator, for each of the K time-domain correlation values, indicating the quantized values of the amplitude.

### Claim 18 (depends on 17)

The method of claim 17, further comprising:
quantizing a value for a phase of each of the K time-domain correlation values using a codebook of phase values
{
e
j
⁢
2
⁢
π
⁢
k
1
⁢
6
:
k
=
0
,
1
,
…
,
15
}
,
wherein the CSI report includes a 4-bit indicator for each of the K time-domain correlation values, and
wherein, for each of the K time-domain correlation values, the 4-bit indicator indicates the quantized value of the phase.

### Claim 19 (depends on 17)

The method of claim 17, wherein the quantized value of the amplitude is given by 1−v, where v belongs to a codebook of amplitude values including
{
1
8
⁢
2
,
1
8
,
1
4
⁢
2
,
1
4
,
1
2
⁢
2
,
1
2
,
1
2
}
.

### Claim 20 (depends on 17)

The method of claim 17, wherein a frequency granularity of the K time-domain correlation values is wideband and is based on the measurement in a CSI reporting band configured for the CSI report.